A new technique for recording respiratory transients at the start of exercise

Davies, Elaine; Hahn, Hans Henning; Spiro, Stephen; Edwards, R. H. T.

doi:10.1016/0034-5687(74)90019-x

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…Some authors have suggested that the overall system is dependent on the levels of accuracy and precision of the volume and gas sensors, and to the precision and accuracy of the VO 2 measurement(27–31). An acceptable level of accuracy for VO 2 measurement is considered ±4–10% (32, 33). …”

Section: Introductionmentioning

confidence: 99%

Indirect Calorimetry: History, Technology, and Application

et al. 2018

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Measurement of energy expenditure is important in order to determine basal metabolic rate and inform energy prescription provided. Indirect calorimetry is the reference standard and clinically recommended means to measure energy expenditure. This article reviews the historical development, technical, and logistic challenges of indirect calorimetry measurement, and provides case examples for practicing clinicians. Formulae to estimate energy expenditure are highly inaccurate and reinforce the role of the indirect calorimetry and the importance of understanding the strength and limitation of the method and its application.

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Section: Introductionmentioning

confidence: 99%

Indirect Calorimetry: History, Technology, and Application

et al. 2018

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“…Another concern is the failure of many computerized systems to correct for water vapor pressure (PH2O) in the expired air, as this pressure is different than in the calibration gas. Although mass-spectrometers can be altered to ignore the contribution of water vapor [10,15,19], most oxygen and carbon dioxide analyzers are sensitive to the presence of water vapor.…”

Section: Methods and Equipments For Indirect Calorimetrymentioning

confidence: 99%

Historical Development of Nutrient and Calorimetry and Expired Gas Analysis Indirect Calorimetry

Yoon¹,

Kim²,

Kim³

2010

Journal of Life Science

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Indirect calorimetry is the measurement of the amount of heat generated in an oxidation reaction by determining the intake or consumption of oxygen or by measuring the amount of carbon dioxide or nitrogen released and translating these quantities into a heat equivalent. In the last 20 years there has been significant development in both laboratory and computerized metabolic systems used in indirect calorimetry. In addition, there has been increased use of breath-by-breath EGAIC. Several researchers have suggested that breath-by-breath analysis, because of their practicality, could fulfill this need for a valid and reliable expired gas analysis indirect calorimetry instrument. It was hoped this investigation would determine the best validation for a precise measurement of breath-by-breath expired gas analysis indirect calorimetry. The problem with the available research is that few studies have examined the validity and reliability of all these different systems for breath-by-breath expired gas analysis indirect calorimetry. Therefore, there is a need to find out the most valid, reliable, and precise measurement of the breath-by-breath expired gas analysis indirect calorimetry.

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“…A complex system that adapted the dry gas approach to measuring ventilation but used a breath by breath analysis has been described as a mean to accurately assess the transients at the start of exercise or a new workload (Davies et al, 1974). While such a system does incorporate lag time calculations, it is completely dependent on the rapid gas analytical facilities of a functioning respiratory gas mass spectrometer.…”

Section: Techniques For Measuring Gas Concentrationsmentioning

confidence: 99%

Pediatric clinical exercise testing system project

Jouni¹

2021

Preprint

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Commercially made exercise testing equipments are designed for testing adults with greater exercise capacity and relatively large minute ventilation compared to pediatric population. As the size of breaths becomes smaller and irregular, as in small children with pulmonary diseases, measurement delay errors may introduce errors to the final results in the exercise testing system. For this reason, a custom made Exercise System was built at the Exercise Laboratory Department at the Hospital for Sick Children. It incorporates a special algorithm that corrects measurement delay errors caused by small breaths. The algorithm calculates the lag time of the expired breath to reach the sampling port and re-aligns the gas concentration reading in time with the corresponding real-time recording of the breath. The Exercise System is currently used for clinical and research purposes. The system shows satisfactory results for adult testing; however, the system requires validation of increase in accuracy of results for testing in pediatrics, especially for ill patients with very small tidal volumes. The main objective of this study is to demonstrate that incorporating the lag time in the algorithm to process and calculate the oxygen (0₂) consumption improves the accuracy of the results in small children exercise testing. In addition, investigate the theory and operation of the Exercise System and document the system designs and testing results for publishing purposes.

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A new technique for recording respiratory transients at the start of exercise

Cited by 10 publications

References 18 publications

Indirect Calorimetry: History, Technology, and Application

Indirect Calorimetry: History, Technology, and Application

Historical Development of Nutrient and Calorimetry and Expired Gas Analysis Indirect Calorimetry

Pediatric clinical exercise testing system project

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